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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1804a407096745d365d1709b7d595985be0790d4a7a8506a8eca2b4577e1924e' 
  AND token = 'Adq/WFrcy08Es+VghNxBdIYBp+7RmnkPWOBTO/7wnYg=' 
  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"
    }
  }
}