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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd469aa48e2f5d9daf47da22cc46245d6503ae3a4b2ab94424c42c0036c7b1f8' 
  AND token = 'N7NPArbvXDvDHTUhgPRWyfhxyon2APBDMXRL9e1WiuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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