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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7d0180e04fba6534e1187552e4cafb9a9631e2fde379590fdf1da015d1cac3' 
  AND token = 'vFejtfZpA+QANeTvuzwDVvgpv6EdXBqM8igFEQLbCas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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