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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246034cec91183159352e48c10778fa1e8af0d65d01a90d9be46698a91243e7d' 
  AND token = 'Y9mcdmUPC8PKv3A/PFby2ECJSar1j7EzNd068K4KqGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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