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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec1e5e3423a2deead885c141508636dda855e3b67033cde2ec89b9fd02cf899' 
  AND token = 'YKTX1h2MLGT1t4GedtvSDjNHbBycQPeeGd60XpW0P38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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