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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f8d2def56bd51f738f9ff07e0e47f45d4cd83f8f8598486f91377d0cea27ee' 
  AND token = 'T+IGbDLs31RJijPYxquA3e2FDMZDsz9I5LPSq1jU7DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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