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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8154335387d821faa098287e000be615b5e5378b5eb9f4c71452ba858c801195' 
  AND token = 'u2Xhe2+F9kznSfhhZZj05NoGck6wKmDeU3FiyYWaSYM=' 
  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"
    }
  }
}