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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5d7a5caa2bfb8471bdcc52a7a10bd1b5b2c6506edb3e7ab3b8ec2b4ee33cd5' 
  AND token = 'HOhSCz8idDhoe7kd5TF3/5B0u2f9TR2zW08l+mCfoc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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