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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e24e8109cb8f5bcd05c336e63ed0bd9edc9b3b7bc1df6de71e64b21e2c9a8d5' 
  AND token = 'FyQZzEbnd4B7fSojaduLXK9gEWF/MFfeAPeQYaXeDFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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