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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61623135bc14108188bcffbb8275c83b422a37f5fb02b3925733acfe5ca2b147' 
  AND token = 'JX3jp3p3AIKDy4VOeSicOB9GGoi1U5t0OHjvgpmcQI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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