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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd169a5f39aa884057f9417d3533401485a98ab555d240ee9873c1c4799239db9' 
  AND token = 'ksrxOoetl7a87wb1cvdoasNKLadyXp6Yj2Qk9wei8W8=' 
  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"
    }
  }
}