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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ffd7c93778c8a591c7580de0b47b726a904b9b21aa8d52a22991975968449b' 
  AND token = 'zzmr4yi5EdcN8+ybGTrxXGTpFr09cAIIxlfEA8nl4ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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