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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9afa73d2a92bcc6d2142779eae64bc3c5ed0368e3c6f20885dcda640e0395dad' 
  AND token = '6O1q58yV4dVdQSn0G4LwI5u7c6maRaIjyRZlOAE403g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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