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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1349a371478e13d85261c3245a6c33dfecbc1480d18121a9c24760cd8d479ae0' 
  AND token = 'KpcKpzqPcLLnCWVI14hmi63CdDNc8FeKse4y7QvU03g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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