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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf3fbf88dc14d637087a8a3ce2b6ef5f591b7a89336fd7a637ea8a667a3da78' 
  AND token = 'ix9XhdEqmSwgi7zGeT9oZUgZTwcAxPWUrYefBKQL1q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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