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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f18a38177eeac7f6183aa4ae2cbf2984a0773569a60c9bf28490b3179920dea' 
  AND token = 'O8LV//974l3XQTJ0ZYnz4lG9uVt7AtsvxNQN4npTQIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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