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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb048ebbc9440cf957528656401043321a4ecd5335e56f83a17d902d73def2f5' 
  AND token = 'Fc0xnL9PA6WdkN1i2XN6M2EVVOg3HbjZuY4xUAnImus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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