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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67806509102f234cfc9364db9b44ef5b121f56c55b8dad6424e097942fe79ecf' 
  AND token = 'A0LJLFoYm/CqN1lUEweYtSS4c4T0utAo6baH3ceUzCA=' 
  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"
    }
  }
}