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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbe8b8192b5b541028caa4d6d3fab3ee0e47403cc6fe0581a0a56b0dbdeaed2' 
  AND token = 'uFiRzXzauh91HdjfB7r4zApe7y3myMef6Tplcd19uSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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