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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3833531024e5fd6e0216518517e800068bf5e1d376a85b5ed050b1c6c031bce5' 
  AND token = 'in4QYOCods18jaowHBRtrVJ6zqZMLstZUeTQy8U5YWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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