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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109b5be70ab6d9ee8679501271b008e77e720c905317fbd11119e5812c8178e6' 
  AND token = '0GsdP3QG5X4Ej6WpwjpDXxh9gt68/FlhTrkRUrQ7l7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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