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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750e4896dfc70b5c6bc3dddc34dc86f00d2f73c7f452db458512ac83eac25d75' 
  AND token = 'F1JbY0ikV19XSpIWK/2OwSfWhxQmDfJFePT5vAvFyss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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