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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d19e5151b0cbd9f6c19eeea109124f30787ba1bd5d718ab9d33f0c3817e285d' 
  AND token = 'cIrA4Oq7IMxhMM0wfqiMQK/Ou+AujewqNvjYVoOGmxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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