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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d1f0ef2890e152813ea70171238c0e234fe80f27ff64848a889a315a7cf45c' 
  AND token = 'aMikQ4tnH8YulvOJedJLccXYEFa++JXc3PF4XEZd5hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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