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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ef4f611e0f8c301b90b51fafaf9db21ee9d1824767004c4be7ee7695051e0f7' 
  AND token = 'pQ5mox0sFsOz+PhEQKdnJu8vfbXsji6mfGEQ638LY0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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