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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2712415b29fc48ae58b56faf668c8ecb3bd6dc3e46970ea778875ebf0ee3fd' 
  AND token = 'VcMbNBPWDo91GoEnzGKe3Gfz5ax4Uw14DCrIcfFX+dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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