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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19912a764879e9e15fedae2fe45fcb8a86981e99dd915f6153512ebc7dea6d52' 
  AND token = 'SzxXkrfSluOY3bFDlZOdGEZORI5xE0SQYpmGggck+vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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