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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07a9f252c9d0084e8d979b0e61e12bbba2be86c9550914fd8cd77bd848633f9' 
  AND token = 'z+jyvMayC5/1Ko4CMsogLbJQbam7id7Mr904f5dv6tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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