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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f1b0fdbe7dad5540ddd03f13010967179693c5e3b2d0841f94e6889a16fba0' 
  AND token = 'sxMQ9ucoT/1fHCq2OL6rsX0ax1HTdZ820bxBguEVgWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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