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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ccb6d4a56e1a0385d47c22c6e77a03e324640b33d35a9fa070bb56d1b8a7e48' 
  AND token = 'AnvVlJPDyf6KBitd7Hr6ssX4YGJEb4OD1lQuVEFFt0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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