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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc9b60bf561ed9bdab743508be686c0bc49556f9b6e0405a8738b6dd1672e56' 
  AND token = 'polO3eMKtzByHS+aV0W4F9oPSZJYZdNz3CckOJkJxx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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