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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5756c11da38aa749199ae5e079d6943deff9f884de16b71ba8c689f385ac8dcf' 
  AND token = 'HCASYd4tQWvtFpl8V6cyKpp8ViX0vZSqmrIoiXa4E1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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