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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586afed97137dee038bdaeb9518278434973280314ac56c0e67f480519405b13' 
  AND token = 'RUHp068Af++x8PtB2vxck1qQPKyC28qCAXB4rJT2QzY=' 
  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"
    }
  }
}