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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa72e994345f83e1c5b7215226e93b55acbbb70b6d25888bd5e43e2be804b1a6' 
  AND token = 'eOemHhwqR7o1u+6oIUTj+APWtY0GLOdPxslGuLq011Q=' 
  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"
    }
  }
}