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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4227efccf2446b25b5c22f656b98a8de060684584fd6f1db8771581ea0886ade' 
  AND token = '1e4HXp7vXmV+f8t2jMrtt0KhZyZr2/VBB2b6T9PvKXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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