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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8e17f54653e848d0c10a77fe24b4c0858e0bfc6675730f6fd8f41552ae818e' 
  AND token = 'Y8zhmxNAcdLapXwQvpruUIYJ0I2DwYfaE8nkNNlLmYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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