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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9efc013e0c39ebd852fdc3b3a8f20291e8f802f604e03464b91f0bc8925979e' 
  AND token = 'h1JVJlEaypUOIEvFM7kBdDixSf8az9TrpEPJE6mUlo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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