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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8da96314d4ba8760567e8cf94a65e93e5199a213ef1cc9de5e1d6b49708d8db' 
  AND token = 'M+QoJSWIAvespxCbHTZKPiGv21E4iV9H2O1cL6LoZSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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