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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ef2d4b1058809da35df306684eded5b08640ad790b41d458138d799b8a1837' 
  AND token = 'eNVPU2tAkd9rvumOTO8H/uiCTuq7R1Xci774Sos64HY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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