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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73825bdcd3e7e0dfb538593b8b7babd93f180c135be2ff9108f63908f0d2a554' 
  AND token = 'kkcTtcGQURe3Cl6APZym8vulfAJKPZ/skxHABhFxhsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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