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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6e44a0b873bb7d1676d64821ec945923f4a46c710eba6db38c246d0ed45d03' 
  AND token = 'YU6X+Y50srZoshkIYLNGGpyIYcSKTcde8ZDfUSQAAso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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