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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e59ec927c44363d1e6e67e0ac03712225166da9b595527e048c638bc04d8f4e' 
  AND token = 'LeWRW+atj9fDJcWslPe8al1JXUfi8bHzbVjoZ+XAz/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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