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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec075831b14014b551045adf19275f61368ec55f1d5ee68f7bddce247552d70a' 
  AND token = 'ESe3CvxHhF84cV9eHGxWcEhA2Ya12kPrp2qy+77Io7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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