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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0752687e6032780fe7f066b66591d7373bb991cf4ef654da43e41c411bd8ab' 
  AND token = '1cgC94URVIvZSTEux2mO10u0PvheuTNFemNQ/yLbGSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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