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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52db1bda3fd67a62e09dc6aa075f87947f9d0e6a1b25767939590868caa0a56' 
  AND token = 'lLySHRvie6lQgzQyN5vkFyA8SOqs0gvzh4aYBsiGuxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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