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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f61566b281eb451467943317b3565f2c24b945a8d1de404c395167223f2eff' 
  AND token = '9/4RI21awfWh2LFo5KMvL9e3q7SVbiA05laeHbmVZ40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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