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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e0bacde6ba6b0b66142202183085d596ef26791458ebf85b958edc120602b7' 
  AND token = 'QI4D0i8iLRQdjqe/uu7TjjMHJLQ9/6cLpsJAq4R0pwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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