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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9693b7dfafbc492bbb72875fa0d78073a4c35cfc6a13465e80b3df4dda81bd' 
  AND token = 'AnB4US/3pTsGMASH7+85xp1M6UXtieV7F3aqBVA/kuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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