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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4ad23031f6dbce058959a651f46ab9c0592dfbffd3f6cad930efa8c7a33eaa' 
  AND token = 'gM3D5hnFNe3Krjg3FuvR2dBSbQT6+4ccfqSjV7Bhmj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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