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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f91da7e6afe3b16280133bcd32101b0439d8991b664031cc92311cde7e0664' 
  AND token = 'VXh+FwWD9DmmR0nVlKxRgekogI4v+uqhSn3/AJlDLOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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