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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741894b53ca1bb29c637292a739ea747292a039bacf96d79c6a1cdd7c7f76788' 
  AND token = '72oOKluZS43PtS3Q3iY+CZqz4kdRkPkS61ayRgv85pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}