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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37dbf1ee2e200b030b98ae49f02636fe640e03162836fb0499f0ff85f6dd09aa' 
  AND token = 'IEc67oWzs3biNhzsgeCmuxgZC5Kuq6EJhYhCYbSonMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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