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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9da77ca4b790338d6e087cf6a6d0bf1a4da47642c3ff973f15f6738b7159acb' 
  AND token = 'cOy5f3XaE2DZfuFrRS9KemRDBf+RzgsvxJ5N4XVqCQ4=' 
  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"
    }
  }
}