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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a05895f58e3fb1aa7f88190bdc6512d5e52a2f51ec33302b633de18bf999ae8' 
  AND token = 'xdsi7pJ6lHKkk177/8l8SW3CGOPtfCk5MCtax4GYcRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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