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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c948ce89a38bd47ec2fa6851c1258e3a3f4af0dec2c4c407162237f8c8cf2f1' 
  AND token = 'bXAq9Hut67m0Qrq7ItUWuNzQgG3YSSs+beJe+oSrZTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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