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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9665d8069e9f188370b7fd632614f7ee3a5bcd1843664cf0c56b82ef14da3b6' 
  AND token = 'rdK/7GhkOnBFU9yMGIEcTdx4APYgngUZvThAe7vz2kk=' 
  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"
    }
  }
}