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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d060bb2362685f86139200931dcfa9eccc6a1499392ba497cdac64485c47187' 
  AND token = '7yR0o+Vawda3j1lhat85b46RmFFhDrP580Gv9ofOyL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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