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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e02e9668196e16ce16f562ee3d128d949512b2019eb8b6a83e3bae5d00c7126' 
  AND token = 'kBhe48irSgdN283Bh9DWZkZG1EEAUN288swGU+eyRXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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